Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation

We present an extensive theoretical analysis of the supercurrent of a superconducting point contact of arbitrary transparency in the presence of a microwave field. Our paper is mainly based on two different approaches: a two-level model that describes the dynamics of the Andreev bound states in thes...

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Autores: Bergeret, F. S., Virtanen, P., Ozaeta, A., Heikkilä, T. T., Cuevas Rodríguez, Juan Carlos
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/671175
Acceso en línea:http://hdl.handle.net/10486/671175
https://dx.doi.org/10.1103/PhysRevB.84.054504
Access Level:acceso abierto
Palabra clave:Física
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spelling Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiationBergeret, F. S.Virtanen, P.Ozaeta, A.Heikkilä, T. T.Cuevas Rodríguez, Juan CarlosFísicaWe present an extensive theoretical analysis of the supercurrent of a superconducting point contact of arbitrary transparency in the presence of a microwave field. Our paper is mainly based on two different approaches: a two-level model that describes the dynamics of the Andreev bound states in these systems and a fully microscopic method based on the Keldysh–Green function technique. This combination provides both a deep insight into the physics of irradiated Josephson junctions and quantitative predictions for arbitrary range of parameters. The main predictions of our analysis are: (i) for weak fields and low temperatures, the microwaves can induce transitions between the Andreev states, leading to a large suppression of the supercurrent at certain values of the phase; (ii) at strong fields, the current-phase relation is strongly distorted and the corresponding critical current does not follow a simple Bessel-function-like behavior; and (iii) at finite temperatures, the microwave field can enhance the critical current by means of transitions connecting the continuum of states outside the gap region and the Andreev states inside the gap. Our paper is of relevance for a large variety of superconducting weak links as well as for the proposals of using the Andreev bound states of a point contact for quantum computing applicationsThis work was supported by the Academy of Finland, the ERC (Grant No. 240362-Heattronics), the Spanish MICINN (Contract No. FIS2008-04209), the Emmy- Noether program of the DFG, and the CSIC (Intramural Project No. 200960I036)American Physical SocietyDepartamento de Física Teórica de la Materia CondensadaFacultad de Ciencias20112011-08-04research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/671175https://dx.doi.org/10.1103/PhysRevB.84.054504reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6711752026-06-23T12:46:27Z
dc.title.none.fl_str_mv Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
title Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
spellingShingle Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
Bergeret, F. S.
Física
title_short Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
title_full Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
title_fullStr Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
title_full_unstemmed Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
title_sort Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
dc.creator.none.fl_str_mv Bergeret, F. S.
Virtanen, P.
Ozaeta, A.
Heikkilä, T. T.
Cuevas Rodríguez, Juan Carlos
author Bergeret, F. S.
author_facet Bergeret, F. S.
Virtanen, P.
Ozaeta, A.
Heikkilä, T. T.
Cuevas Rodríguez, Juan Carlos
author_role author
author2 Virtanen, P.
Ozaeta, A.
Heikkilä, T. T.
Cuevas Rodríguez, Juan Carlos
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física Teórica de la Materia Condensada
Facultad de Ciencias
dc.subject.none.fl_str_mv Física
topic Física
description We present an extensive theoretical analysis of the supercurrent of a superconducting point contact of arbitrary transparency in the presence of a microwave field. Our paper is mainly based on two different approaches: a two-level model that describes the dynamics of the Andreev bound states in these systems and a fully microscopic method based on the Keldysh–Green function technique. This combination provides both a deep insight into the physics of irradiated Josephson junctions and quantitative predictions for arbitrary range of parameters. The main predictions of our analysis are: (i) for weak fields and low temperatures, the microwaves can induce transitions between the Andreev states, leading to a large suppression of the supercurrent at certain values of the phase; (ii) at strong fields, the current-phase relation is strongly distorted and the corresponding critical current does not follow a simple Bessel-function-like behavior; and (iii) at finite temperatures, the microwave field can enhance the critical current by means of transitions connecting the continuum of states outside the gap region and the Andreev states inside the gap. Our paper is of relevance for a large variety of superconducting weak links as well as for the proposals of using the Andreev bound states of a point contact for quantum computing applications
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-08-04
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/671175
https://dx.doi.org/10.1103/PhysRevB.84.054504
url http://hdl.handle.net/10486/671175
https://dx.doi.org/10.1103/PhysRevB.84.054504
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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